Ajay Narayan cheers as the race is called for US President Barack Obama by a television network during the Nevada State Democrats' election night party at the Mandalay Bay Resort in Las Vegas, Nevada. Sam Morris/Las Vegas Sun/Reuters

Supporters of US President Barack Obama cheer during his election night rally in Chicago. Philip Scott-Andrews/Reuters

Former Democratic state Rep. Joyce Beatty (l.) celebrates with Rev. Jesse Jackson at the Ohio Democratic party election night celebration in Columbus, Ohio. Beatty was elected in the newly drawn 3rd Congressional District. Tony Dejak/AP

A U.S. Republican presidential nominee Mitt Romney supporter holds a flag after President Barack Obama was re-elected at the Romney election night rally in Boston, Massachusetts. Eric Thayer/Reuters

Supporters, from left, Kelly Jolley, Lindsay John, and Tami Hemingway Smith react as the watch televised reports projecting President Obama as the winner during a Democratic Party election party in Salt Lake City, Utah. Trent Nelson/The Salt Lake Tribune/AP

A supporter watches the election results at the Election Night party for President Obama in Chicago. Charles Rex Arbogast/AP

Supporters react to the election results at the election night party for President Barack Obama in Chicago. M. Spencer Green/AP

Supporters of U.S. President Barack Obama cheer the news of the president's apparent re-election during his election night rally in Chicago. Jeff Haynes/Reuters

Someone dressed as the character Cookie Monster watches TV screens in Times Square giving presidential election results in New York on Tuesday, Nov. 6, 2012. Carlo Allegri/Reuters

Supporters cheer as election results are announced at the election night party for President Barack Obama in Chicago. M. Spencer Green/AP

Martha Nunez of the Bronx reacts to positive predictions for President Obama as crowds watch election results in Times Square in New York. John Minchillo/AP

President Barack Obama calls Wisconsin volunteers as he visits a campaign office call center the morning of the 2012 election. Carolyn Kaster/AP

David French, of Columbia, Tenn., consoles his son Austin as they watch vote results displayed on a screen during the election night rally for Republican presidential candidate and former Massachusetts Gov. Mitt Romney in Boston. David Goldman/AP

President Barack Obama supporters celebrate televised reports of his projected re-election for president of the United States during a rally at M&T Bank Stadium in Baltimore, Md. Jose Luis Magana/AP

Members of the National Guard walk past a house damaged by Superstorm Sandy as it is painted with an American flag in the New Dorp section of Staten Island, New York, Tuesday, Nov. 6, 2012. Seth Wenig/AP

A large media group awaits President Obama before his Election Night rally in Chicago. Larry Downing/Reuters

Jalyn Wilson, 6, waits while her grandmother stands in line to vote at the Clarence Cuffee Community Center in Chesapeake, Va. Virginia is a key battleground state in the presidential race. Amanda Lucier/The Virginian-Pilot/AP

Dora A. Winter looks up after an 'I Voted' sticker was placed on her forehead at Karcher Church of the Nazarene on Election Day in Nampa, Idaho. Adam Eschbach/Idaho Press-Tribune/AP

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, talks on the phone with the store supervisor as he and his vice presidential running mate, Rep. Paul Ryan, R-Wis., make an unscheduled stop at a Wendy's restaurant in Richmond Heights, Ohio. Charles Dharapak/AP

Oklahoma Lt. Gov. Todd Lamb's shadow is projected against a backdrop during the state's GOP watch party in Oklahoma City on Election Day. Sarah Phipps/The Oklahoman/AP

President Barack Obama buttons at the Obama field office located on Wyoming Avenue in Scranton, Pa. Butch Comegys/Scranton Times & Tribune/AP

After casting his vote, World War II Navy veteran Robert Carper waits for his wife at the Cave Spring precinct at the Church of the Holy Spirit, in Roanoke County, Va. Mr. Carper said he voted for the first time in 1944 – Franklin Roosevelt vs. Thomas Dewey. Kyle Green/The Roanoke Times/AP

A voter casts her ballot in the Old Town Hall on Westport Island, Maine. Former Sen. Olympia Snowe's US Senate seat is up for grabs in Maine. Robert F. Bukaty/AP

A voter leaves a polling station outside Hayden Park in Phoenix. Joshua Lott/Reuters

Cooks Horacio Contrares and Juan Carvantes (r.) look on as voters cast their ballots at Taquerias Los Comales in Chicago. John Gress/Reuters

Voters fill the booths at the Stockton Community Center in Stockton, Minn. After enduring a grinding presidential campaign, Americans are heading into polling places across the country. Andrew Link/Winona Daily News/AP

Voters cast their ballots in the general election at Kirkwood Community Center in Kirkwood, Mo. Missourians will decide a close Senate race between the GOP's Todd Akin and Democratic incumbent Sen. Claire McCaskill. Jeff Roberson/AP

Hal Pigg is reflected in an image of a flag, as he casts his vote in Jamul, Calif. Gregory Bull/AP

Carol Burton, an Obama campaign volunteer, searches for a location to place election day signs before polls open on Tuesday morning, Nov. 6, 2012 in Austin, Texas. Tamir Kalifa/AP

Second-graders Brayden Gentzyel (l.), as President Obama, and Harry Perkins (r.), dressed as Mitt Romney, from Valley View Elementary School in the York Suburban School District in York, Pa., lead a parade of students around the school to encourage people to vote. Jason Plotkin/York Daily Record/AP

Poll worker Chris Theriot hands out an 'I Voted Today!' sticker after a resident placed her ballot in the box at the North Street School in Greenwich, Conn. Charles Krupa/AP

A sign erected by a community group called Rebuild Rockaway shows voting locations in the Rockaway neighborhoods of the borough of Queens, New York, Monday, Nov. 5, 2012, in the wake of Superstorm Sandy. Craig Ruttle/AP

Under the lights of a generator, voters wait in line outside of a tent serving as a polling site in the Midland Beach section of Staten Island, New York. The original polling site, a school, was damaged by Superstorm Sandy. Seth Wenig/AP

Horse Gall precinct clerk David Smith (r.) greets voter Paul Hiers at the home of Vincent Smith in Varnville, South Carolina. The polling place for the US presidential and local elections is located in the den of David Smith's father's home. Randall Hill/Reuters